After a water had boiled, the temperature of the water decreases by 22degrees. The mass of the water in the kettle is 0.50kg. The specific heat capacity of the water is 4200J. Calculate the energy transferred to the surrounding from the water.

An Na ion has a charge of + 1 and an O ion has a charge of - 2. How many Na ions does one O ion need to balance charges

A rocket is moving away from the solar system at a speed of 7.5 ✕ 103 m/s. It fires its engine, which ejects exhaust with a speed of 5.0 ✕ 103 m/s relative to the rocket. The mass of the rocket at this time is 6.0 ✕ 104 kg, and its acceleration is 4.

How have the competing explanations' experiments on atoms affected the development of the atomic model?

Which radioactive decay undergoes transmutation?

Why is the heat of fusion of any substance generally lower than its heat of vaporization?

What causes physical vibrations in transformers at twice the frequency of the AC power involved.

Projectile motion is a combination of which two types of motion? parabolic and curved straight and diagonal horizontal and vertical constant and linear

If a mass of a material is 100 grams and the volume of the material is 15 cm3, what would the density of the material be?

After three half-lives of an isotope, 1 billion (one-eighth) of the original isotope's atoms still remain in a certain amount of this element. How many atoms of the daughter product would you expect to be present?

A group of two or more stars is called a A. solar system B. neutron star C. protostar D. star system